[quote author=yoann link=topic=15684.msg17038#msg17038 date=1467897010]I told him yesterday night on IRC that all of his ConcavePolygonShapes were empty.When you look at their content using the inspector, you find that they contain empty array of data : "Data : Array[0]".Something must have gone wrong when he created his polygon shapes.[/quote]That's the thing, I don't know what did go wrong. I tried following the example of how collisions are done in other grid maps, but I can't figure out what went wrong.